I think start-up time is the main factor that separates
the two fuel cell technology.
SOFC requires a few minutes to heat up to 850 degree C.
Here is the email response I received from Eric Potter, GLE.
DATE:FEBRUARY 7, 2000
TO: DENNIS THAM
FROM:ERIC POTTER - GLOBAL
In reference to your note below, I will clarify that Global is not looking at using SOFCs for main propulsion for the vehicle, but rather as an auxiliary power unit to power the car's electrical loads - an internal combustion engine will provide propulsion. Your comments regarding new battery technology however are still very applicable for an APU type system.
Regarding thermal cycling of the SOFCs, last summer, Global indicated that it has developed a proprietary compressible sealing system for its SOFC stacks. This sealing system allows the stack to be thermally cycled and also improves vibrational tolerance. This system was a major advance for SOFC technology in the drive to make it a commercially viable product.
Best Regards,
Global Thermoelectric Inc.
Eric N. Potter, P.Eng.
Business Development Manager
-----Original Message-----
From: Dennis Tham
Sent: Sunday, February 06, 2000 12:31 PM
To: Eric Potter
Subject: Re: Fuel Cell start up process
Thanks for your reply. From your last email,
I gathered that GLE is considering SOFC a main power source for propulsion. I think start-up would not be a problem since many automotive manufacturer such as Honda and Toyota have adapted battery for additional power for their hybrid vehicle.
I have another question regarding short operating cycle (turning ON/OFF). As I understand, SOFC is made up by some sort of specialized ceramic, Is thermal shock a problem? Is the material fairly stable in 850 degree C?
Even with steel, the material becomes soft, of course, I am not comparing apple to apple, but is it a concerned or not a concerned at all. I hope you can understand my concerns.
Thanks
Dennis
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